Answer:
Molarity = 0.08 M
Explanation:
Given data:
Volume of NaOH = 24.11 cm³ (24.11/1000 = 0.0241 L)
Mass of C₈H₅KO₄ = 0.43 g
Molarity of NaOH = ?
Solution:
First of all we will write the chemical equation:
C₈H₅KO₄ + NaOH → H₂O + KNaC₈H₄O₄
Number of moles of C₈H₅KO₄:
Number of moles = mass/ molar mass
Number of moles = 0.43 g / 204.22 g/mol
Number of moles = 0.002 mol
Now we will compare the moles of C₈H₅KO₄ with NaOH.
C₈H₅KO₄ ; NaOH
1 : 1
0.002 : 0.002
Molarity of NaOH:
Molarity = number of moles / volume in litter
Molarity = 0.002 mol /0.0241 L
Molarity = 0.08 M
If it's for study island it's A.The effect is unpredictable because the ice changes two variables at the same time.
Answer:
ΔH = + 116 kJ
Explanation:
The equation for the reaction is given as;
HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l) ΔH = - 58 kJ
If we multiply the above equation all through with (2); we have:
2 × (HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l) ΔH = - 58 kJ)
2HCl(aq) + 2NaOH(aq) → 2NaCl(aq) + 2H2O(l) ΔH = - 116 kJ
If we tend to reverse the above equation; we have
2NaCl(aq) + 2H2O(l) → 2HCl(aq) + 2NaOH(aq) ΔH = + 116 kJ
∴ The reaction is said to be endothermin , as 116 kJ are absorbed.
Answer:
Antacids are medicines that counteract (neutralise) the acid in your stomach to relieve indigestion and heartburn. They come as a liquid or chewable tablets and can be bought from pharmacies and shops without a prescription.
For the answer to the question above, t<span>he energy that is required to break all the carbon-hydrogen bonds in methane is 891 kJ/mol. In 0.1 mol of methane, you would need 89.1 kJ.
I hope my answer helped you. Have a nice day</span>